package signers

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/base64"
	"golib.gaore.com/GaoreGo/gaore-common-sdk-go/sdk/auth/credentials"
)

type AliAppcodeSigner struct {
	credential *credentials.AliAppcodeCredential
}

func (signer *AliAppcodeSigner) GetName() string {
	return "HmacSHA256"
}

func (signer *AliAppcodeSigner) GetAccessKeyId() (string, error) {
	return signer.credential.AccessKeyId, nil
}

func (signer *AliAppcodeSigner) GetAccessKeyFrom() (string, error) {
	return "", nil
}

func (signer *AliAppcodeSigner) Sign(stringToSign, secretSuffix string) string {
	secret := signer.credential.AccessKeySecret + secretSuffix
	return ShaHmac256(stringToSign, secret)
}

func NewAliAppcodeSigner(credential *credentials.AliAppcodeCredential) *AliAppcodeSigner {
	return &AliAppcodeSigner{
		credential: credential,
	}
}

func ShaHmac256(source, secret string) string {
	key := []byte(secret)
	hmac1 := hmac.New(sha256.New, key)
	hmac1.Write([]byte(source))
	signedString := base64.StdEncoding.EncodeToString(hmac1.Sum(nil))
	return signedString
}